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F. C. FURLOW( LEVEUNG DEVICE. APPLICATION man 1ML-4,131

UNITED STATES PATENT OFFICE.

FLOYD CHARLES FURLOW, OF MDNTCLAIR, NEW JERSEY, ASSIGNOB T CITES ,IELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY LEVELING D-EVCE Specification of Reissued Letters ?atent. Reissued 25, 1922.

OriginalNo. 1,315,600, dated September 9, 1919, Serial No. 174,186, filed .Tune 12, 1917. Application for y reissue filed January 4, 1921. Serial No. 435,025.

To all whom t may concern: y

Be 1t known thatl I, FLorn C. Funnow, a

citizen of the United States, residin at.

I-for its object the provision of apparatus to grammatic manner. an electrical elevator' level the car platform with a landing, in the4 event of the VVcar overruning or underrunning the landing, 'said apparatus involving improved features of construction and arrangement of parts as will hereinafter he more fully set forth. c

Referring to the accompanying drawings, Figure l illustrates in a more or less diasystem einbod'ying the present invention; Fig. 2 illustrates an enlarged view. of the elevator' car, together with the mechanism as arranged in accordance with "the present invention, to level the car with a landing;

and Figure 3 illustrates in plan view, the 'car leveling mechanism illustrated in Fig. 2. Referring more particularly to Fig. lit comprises an elevator car C, adapted for operation by an electric motor M, through the inter-mediaryvof the hoisting apparatus comprising' the worm and gear connection A., hoisting drum D. and rope or cable l. ,A usual ear coiluterweight E is provided, it being connected to aback-drum rope or cable il. c n, l Y

An electrofmechanicalr brake of `a usual type is designated B,`a motorrheostat 'l`, and floor landings'li, L." .y -Y l Electro-magnetic reversing switches lt, R control the motor M, operating windings for these switches being controlled by 'a car switch S. Q

The elements thus far describedare well known in the art and have a well known mode of operation.

According to the present invention, supplemental means are provided to raise and lower the 'car platform C', suoli 'movement of the platform being effected independently of.

hoistiwj cable l as illustrated in Fig. 2. The supplemental means comprise a .pair of vertically disposed rotatable jackscrewsfG, G, seated at their lower end by beams- 2, the latter being seated on the rope hitch bloelr The elevator oar is suspended directly by the jackscrews there being secured to 'the framework H of the car, a pair of blocks J, each having screwthreads engaging the j ackscrews.

The jackscrews are adapted for rotation in one direction or the other by means of a supplementary reversible electric motor M, through the intermediary vof any suitable type of reduction gearing such as K for exH ample. The supplementary motor M', etc., is supported by means 2', secured to separa-` tors X, the latter being secured to the beams 2.

A brake B of the electro-mechanical type is provided in conjunction with the supplemental motor M.

The supplement-ary motor fM is controlled automatically to raise and lower-andlevel the car with a desired stoppingv point or landing in the event of the car under-ru1n ning or oversrunning the landing, by means which will be termed vhere-in car leveling earns and c'oacting switches.

There are two of these cams 3, 23 at each floor landing, the cams beingl fixed in the hatchwav and offset from each other. The switches 4, 4t are movable with the elevator car, each having associated therewith a roller 5. The cam 3 coacts with the switch a, automatically 'to control the supplementary motor M, etc., to raise and level the car with a desired landing, and the cam 3 coacts with the switch 4 automatically to control the supplementary motorM to lower and level the car with a landing.

The blocks J normally assume position substantially midwayl between-the ends of the jackscrews as illustrated in Fig. 2, the jaelrscrews eifeeting movement of the blocks thereon about twelve or fourteen inches in either direction from the normal, and in this manner movement of the car platform in an ascending and descending direction is effected.

An additional set of cams 6, 6 secured to the beams 2 and coactingswitches 7, 7 secured to the car,control the supplementary i etc., operating windings for these switches l" being controlled by the car leveling cams i 4' breaks the circuit for p brake ywill. .Ioivv"release and the and switches. l

A ctional starting resistancer9 for the motor M, is controlled yby anI accelerating magnet 10 havinga well knownv mode of operation.

A description of' the various `elements through a completecyc'le" of operation will now be given. s f

Movement of the car switch handle toward the right hand closes a circuitor the operating winding of the reversing switch R', the latter operating to close a. circuit for the motor M and winding ofthe brake B. The

motor operate to cause travel of the car nin a descending direction. Centering the car switch S, causes 4the reversing switch R' toopen, thereby opening the ymotor circuit and effecting application of the brake to stop the car.v When thecar approaches to within about twelve or fourteen inches of the landing L, the roller 5, associated with theeswitch 4' rides on the cam 3', and thus closes the switch 4.` The switch 4 now closes a cir-y cuit f'or the operating winding of the reversing switch R" which circuit maybe traced as follows main to wire-11, to feed wire 14, by way of a series of back contacts 12, 13, controlled by the reversing switches R, R', respectively, switch 4', wire 15, and thence through winding 16 of the reversing switch R". to the line. The reversing switch R'" now operates and closes a circuit to the supplementary" motor M", andwind-4 ing of brake B. The brake now releases, and the motor M' through the intermediary of the reduction gears rotates .the jackscrews.

In this manner the car platformis moved by the screws in a ydescending direction until the platform is level witlrthe landing, at which time the roller'5 rides oil the lcam 3', and allows the switch 4' action of a spring 17. Opening the switch the winding 16' of the reversing switch, the latter now opening,

thereby opening the circuit to they motor M", I

and effecting application of' the brake B' to' stop the car platform. f f i It will be noted thatthe feed wire 14A in cludes the series of back contacts on the ref# versing switches R., R', which results in the" motor M' being put into operation bythe cams and switches only when both ofthe re versing switches are in open position, which of course necessitates the car switch being..

in a central or normal positionfy ment with the cam 6, thus the to open by the p 4nasen` verse direction tothat heretofore described, f

and .thus the car platform is moved by the screws in anascending direction, the parts being automatically brought to rest when the car platform is level with the landing,

which operation is eiected when the `roller 5 rides ofi'l the cam 3 and allows the switch 4 to open by the action of a spring 17 ssunie' now that the car has been lowered on the jackscrews to ya dotted line position as indicated in Fig. 1, which would be ,the

relative position of the parts as effected by the leveling` operation for a descending car running short of the landing. The car frame being in this position brings the roller 20 associated with the switch 7' into engage switch 7'- is 21r is controlled by now closed. Afeed wire controlled by the auxiliary contacts 22,v

f -switch R', and Contact 12 and 23 associated With the reversing switch R, so thatwhen either reversing switch closes to effect opere ation of the car by the motor M, a circuit f is closed to one or the other of the reversing switches R, R"', in the one instance when the switch 7' is closed by coaction. withthe cam 6, and the other when thek switch is closed by coaction with the cam'.

Take now the first instan-ce with the car in dotted linepositon, and the switch 7' closed by the cain, a circuit may be traced for "the winding 184 of the reversing switch R" as follows :4+ main, wire 24, auxiliary contacts 22 (assuming the reversing switch R is closed) feed wire-.21. switch-7', wire 25, and winding 18 to line. rlhe reversing switch RH' will now close and effect 0peration of' the motor M' and raise the `car thereon until the latter reaches its normal or centered position on the screws at which time the roller 2() will rideoff of the cam 6, allow the switch 7 to open by the actionof a spring 17", and thus effect stopping of the motor Ml.

l It' the car framev assumes 'the position on -the ]ackscrews above the normal or centered position, the operation to center the car on ther screws is effected by the cam 6', and switch 7, the latter 'controlling a 'circuit for the reversingA switch R", the 'latter controlling the motor M' to lower 'the car on thejackscrews when either one of the reversingswitches or R" is closed.'` L.Thus it will be seen. that when the car frame assume-sa `position on the jackscrews either` aboveY or below` the normal positionas indicated in Figs. 1 and', the frame is In the event of the descending car linden L to rotate the j ackscrews iop reo

returned to normal position nautomatically landing, which movement for f be caused by loading or unloading the platwill be automatically returned. levelI with the landing, this operation being 'efectedby the cams, and coacting switches, Which function to control one of the motors, these elements in effect acting to maintain the car level with the landing.

` Without limiting myself to the precise details and arrangement. of parts as herein illustrated and described, what I claim as newand desire toysecure by Letters Patent 4of the United States'isr* 1. In an elevator system, the combination. with the car platform, va motor, supporting means operatively connecting the platformv and motor, a supplementary motor to move the car, .said supplementary motor being suspended by the supporting means. and means to control the` supplementary ymotor to level the car platform with a landing.

'2. In an elevator system, the'conibination with the car platform, a motor. supporting means operatively connecting the platform and motor, a supplementary motor and connections to move the car.l said supplementary motor being susjjiended by the supporting means,"and means automatically to control the',` supplementary motor .to raise or lower tbe-car platform and level the same with a landing. y

3. In' an elevator system, thecombination i with" the cai" platform, ay motor, a hoisting means automatically to 'control the cable connecting the car platform for operation by the motor. a supplemental motor and a conhection-operable thereby suspended by thefcable to move the car platform, and

supplementary motor to raise or loiver the platform'and Ilevel the same with a landing.

4;- In an elevator system, the combination with the car platform, a motor, a hoisting cable connecting the car platform for operation by the motor, a supplementary motor, a

.threaded shaft suspended by the cable and supporting the platform in a centered position relative to the ends'ofthe shaft, means `"operating and connecting the supplementary motor and shaft, means to control the supplementary motor, to raise or. lower the car platform and level the same with a landing, and additional controlling means to return the car platform to said centered position.

5. In an elevator system, the combination withithe hoisting apparatus, a threaded shaft suspended by thel hoisting apparatus, car platform, suspended by the said shaft, a vhntol'j operatively connected with said shaft,

fthe car with the several landinms meansto control the motor to raise or lower the car platform and level the same With a landing, and means to control the motor to actuate the shaft to return the platform to a predetermined normal position from Which.

the platform is movable substantially equal distances up or down by rotation of the threaded shaft.

6. In an elevator system, the'combination with the hoisting apparatus, a threaded shaft suspended by the hoisting apparatus, a car platform supported by the said shaft, a motor operatively connected to the shaft,

means to' control the mot-or to raise or lovver` the car and level the same with a landing, and means operable automatically to control the motor to return the car platform to a predeterminednormal position from Which the platform is movable substantially equaldistances up or down by rotation of the threaded shaft.

7. In an elevator, the combination with a hoisting cable, a threaded shaft suspended by the cable, a car frame operatively engaging the threaded portion of the shaft for movement up and down thereon by rotation of the shafta motive device, and a connection between the motive device and the l said shaft.

8. In an elevator system. a car platform, a rotatable screw-threaded shaft, a screwthreaded connection between the car platform and the shaft, whereby upon rotating `the shaft the car platform will be caused to bel moved upward or downward along the shaft` according to the direction of rotation of the shaft, and the car platform be thereby raised or lowered, motive means to rotate the shaft; and means controlled by the car to control the said motive means for rotating the shaft to cause the car platform to be raised or lowered as above stated.

9. ln an. elevator system, adapted to level the platfornr of the ear with the several landings in the elevator service operation of the rar, the'car, the main motor hoisting apparatus, hoisting cables between the car and main motor hoisting apparatus. and an auxiliary power apparatus, adapted to leve-.l n the elevator service operation o f the car, independently of the main motor hoisting apparatus.

l0. ln an elevator system, adapted to level `the 'platform of the car with the several 'in the elevator service operation of the car,

independently of the main' motor'hoisting apparatus.

"11,111 an elevator systennadapted tolevel the latform of the car` with vthe several landings in the elevator service operation of the car, the car, the main motor hoisting apparatus, hoisting cables ybetween the car and main motor hoisting apparatus, and an auxiliary power apparatus adapted to levelV the car with the several landings in the elevater service operation of the oar, inde pendently of the mainl motor hoisting apparatus, and means to control the operation of the main motor hoisting ,apparatus and the auxiliary ,power apparatus to operate the l2. In an elevator system, adapted t0 level the platform of the car, with the several landings in theeievatory service operation of the car, the ear, the main motor lfioistingl apparatus, y' hoisting cables between the car and main motor hoisting apparatust and an auxiliary power apparatus, adapted to level the 'car with the several landings in the elevater service operation of the car, independently of 'the main motor hoisting apparatus, and. controlling means common toy both the main motor` hoisting apparatus and the auxiliary npower apparatus to control the service operation of the car to bring Withthe several landings.

the car to a stop level with the several landings.

13. In the platform of the ear with the several landings in the elevator service operation of the ear, the car, the mainl motor hoisting apparatus, hoisting cables `between the car and the main motor hoisting apparatus, and an auxiliary. power hoisting apparatus, adapted to levelthe ear with the several landings in theelevator service operation of the ear, independently of the main motor an elevator system, adapted to level hoisting apparatus, and controlling mecha' nism common to both the main motor hoisting apparatus and the auxiliary powerl hoisting apparatus, to control the service operation of the ear and bringi it to a vStopleVel 14. In an elevator' system, adaptedto level the platform of the carpa/ith theA several landings `in the elevator service operation of the oar, the car, the` malin. motor hoisting apparatus, hoisting cables between the car and main motor hoisting apparatus, and an auxiliary electric power apparatus, adapt.` ed to level the car lwith the several landings in the elevator service operation ofthe calefindependently of the main motor hoisting apparatus. z

l5. In an elevator systexmadapted to level the platform of the `ear with the several landings in the elevator service operation of the'car, the ear.z the main motor hoisting apparatus, lioistingcables between 'the car and main motor hoiiiting apparatus, and an auxiliary electric motor hoisting 'appara-` tus,I adapted to level the car with `the several landings Iin the elevator service" oper.

ation of the car', independently of the main l ymotor hoisting apparatus.

16. In an elevator system, adaptedv to 7level -the platform of. the car vWith-the several landings inthe elevator service operation of thecar, the car, the main electric motor hoisting-apparatus, hoisting cables between the car andmmain motor hoisting apparatus, and an auxiliary electric moborv'hoisting ap,` paratus adapted. to level the canwith the several landings in 'theI elevator servicefoperation of the car, independently lof the main motor hoisting apparatus, andan electrically operable controlling "mechanism common to both the main electric hoisting apparatus and the auxiliary electric motor hoisting apparatusto control thelsevice operation of the car tobring` it to a Istop level with the several landings' 17. In an elevator system,tl`1e combination with the car platform, a hoisting motor, supporting means operatively connecting the platform land motor, and a suppl.ernen-r tary motive means, arranged, adapted and constructed, automatically tomove the platform independently of themotion of said"A motor to a level with the-` landings. V

18. In an elevator system, ,the lcombination with the Vcar platform, a hoisting motor,N supporting means operatively connecting the platform and motor, and a supple vmentary motive means, arranged, adapted and constructed to automatically move the platform toward the desired` landing from either side thereof, and to come to rest when the platform is level with the landing;

19. In an elevator system, the combination of a car, a `hoisting motor therefor, supporting means operatively connecting themcar,` y,1'05

and motor, and a supplementary motive means, arranged and adapted to be inl a.'

central position operatively relativelyto "the car platform, and to be uctuable tomove the 1 11o car independently of f the motion of the said motor to level the platform `with the floor landing, and, When tli`esaid"motivel means have functioned to level the `plat-l form with the landing, the motive means to be at that time' substantially as they formerly were in their centered position operativelyfrelatively to the car platform; y

20. In an elevator s'ystem,'the` combination 'of a car, of main and auxiliary hoisting motors, and a hoisting cable between the` car and motors, the car being operable direetlylfrom each of the two motors Without i the intervention ofthe other motor;

21. In an elevator system, the combination' of a car, main and auxiliary hoistingmotors, and a hoisting cable between. the` 'car and motors, the car being operable directly from l each of the two motors separately'and severally Without the intermediation. of the other motor.

2Q. Tn an elevator system, the combination ot a car, main and auxiliary hoisting 5 motors, and a hoistingcable between the car and motors, the car being operable directly from each ot the tivo motors separately and severally without thc intermedition of the other motor and without movement of the hoisting cables.

23, A hoisting `mechanism for elevator cars 'for initially moving the car to a point near to its landing position, and then completing the trip by imparting a second or 'inal movement to the car, said mechanism including a plurality of hoisting machines, nach .independently operated by a motor, a connterweight, and cable connections between the same, means for automatically controlling the said hoisting machines so instructed and arranged that when the main orI master machine is moving the car to a. point near to or approaching its landing, the other or leveling machine is idle, 11i* and when the iinal movement of the car is made. die first or master machine is idle, and the second or leveling machine is opor approaching its landing, the othfregr;l

leveling machine is idle, movement of the car is made, the irst or master machine is idle, land the second or leveling machine is operating independent ot the master machine, until the car "1s level with the licor, Where it is automatically stopped.

In testimony Whereot` l have si ned my name to this specification this 221i October, 1920.

FLOYD CHARLES FURLOW.

and when the' final day of 

